/**
 * <pre>
 * @(#)PolarNomalizer.java 1.00 2009-11-13
 * 
 * Copyright (c) 1998, 2009 Regular Individual. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * Contributor(s):
 *     Haixu Huang
 * </pre>
 **/
package cn.sh.huang.chart.data.ext;

/**
 * <pre>
 * PolarNomalizer ...
 * 
 * @version 1.0
 * </pre>
 */
public class PolarNomalizer implements Nomalizer
{
    private double sum = 0;

    /*
     * (non-Javadoc)
     * @see cn.sh.huang.chart.data.ext.Nomalizer#normalize(java.lang.Double)
     */
    public Double normalize(Double value)
    {
        if (value == null) {
            return null;
        }
        if (sum < PRECISION) { // Undefined range
            throw new RuntimeException("!ERROR! Undefined scale range.");
        }
        return new Double(value.doubleValue() / sum);
    }

    /*
     * (non-Javadoc)
     * @see cn.sh.huang.chart.data.ext.Nomalizer#setRange(java.lang.Double)
     */
    public void setRange(Double value)
    {
        if (value != null) {
            sum += value.doubleValue();
        }
    }

}
